Start-Up Telecom Account Management App

I'm seeking a skilled web application developer to create an application designed to manage our start-up's telecom accounts. The app will need to handle both mobile and landline integration and streamline account management.

Below are the core functionalities for the project:

- **Account Management**: The app must be capable of tracking the history of each account with relative details.

- **Line Assignment/Removal**: A crucial function of the app is assigning and removing telephone lines to the appropriate accounts. This process should be manually approved by an admin for enhanced control.

- **Mobile and Landline Integration**: The app must seamlessly integrate with both mobile and landline telephone accounts.

Moreover, it's necessary that the application is designed for ease of use, primarily by management personnel.

Ideal Skills/Experience:
- Proven experience in web app development
- Familiarity with telecom systems
- Proficiency in backend development for manual approval functions
- Strong user interface design skills to prioritize usability